One hundred and sixty-five million years before a human ear could have been present to hear it, the Jurassic forest hummed with ultrasonic calls no living person will ever naturally perceive. Scientists have now reconstructed the vocalizations of ancient katydids by reading the microscopic architecture of fossilized wings, discovering that insects had mastered high-frequency acoustic communication tens of millions of years before bats would independently arrive at the same strategy. The achievement is less about a single species and more about what it reveals: that the deep past was never trul
Scientists Reconstruct 165-Million-Year-Old Jurassic Insect Sounds
The Jurassic forest was filled with calls we cannot hear
Mark
So they actually heard what these insects sounded like? How is that even possible from a fossil?
Mimi
Not heard exactly—reconstructed. The katydids' wings have these tiny ridges and teeth that create sound when they rub together. Those structures fossilized. Scientists studied them and modeled how sound would move through them.
Mark
And they found ultrasound? That seems oddly specific.
Mimi
It is specific, and that's what makes it remarkable. These insects were using ultrasonic frequencies 165 million years ago. Bats didn't evolve that ability for another 55 million years.
Mark
Why would an insect need ultrasound? Bats use it to see in the dark.
Mimi
Probably for communication—finding mates, signaling to each other. We don't know exactly. But it shows ultrasound wasn't invented by bats. Insects got there first.
Mark
Does this change how we think about the Jurassic?
Mimi
It does. We tend to imagine ancient forests as silent or filled only with sounds we can hear. But they were full of frequencies we'd never detect without technology. The whole sensory world was different.
O Pulso
- Researchers have crossed what seemed an uncrossable threshold — giving voice to creatures that fell silent 165 million years ago by decoding the geometry of their fossilized wings.
- The discovery upends the established timeline of ultrasonic communication, revealing that insects were signaling in frequencies beyond human hearing a full 55 million years before bats evolved their celebrated echolocation.
- The tension lies in what we assumed we could never recover: not bones or shells, but sound itself — a sensory dimension of ancient life that seemed permanently erased by time.
- By digitally modeling how sound moved through preserved stridulatory structures, scientists have reconstructed an approximation of the Jurassic acoustic world, transforming paleontology into something closer to archaeology of experience.
- The field now stands at the edge of a broader question — if fossilized wings can yield sound, what other lost senses might be hiding in the fossil record, waiting for the right methodology to unlock them.
One hundred and sixty-five million years before a human ear could have been present to hear it, the Jurassic forest hummed with ultrasonic calls no living person will ever naturally perceive. Scientists have now reconstructed the vocalizations of ancient katydids by reading the microscopic architecture of fossilized wings, discovering that insects had mastered high-frequency acoustic communication tens of millions of years before bats would independently arrive at the same strategy. The achievement is less about a single species and more about what it reveals: that the deep past was never truly silent, and that the tools to hear it are only now coming into our hands.
A team of scientists has accomplished something that once seemed firmly beyond reach: they have reconstructed the calls of insects that lived 165 million years ago. The subjects are Jurassic katydids — long-bodied relatives of grasshoppers — and what the researchers found in their fossilized remains was not merely anatomical detail, but the raw material of sound itself.
Katydids produce their calls through stridulation, rubbing their wings together to generate vibrations. The microscopic ridges responsible for this friction can survive in fossilized specimens, and by studying these structures in Jurassic-era insects, scientists were able to model how sound would have moved through them — then digitally recreate what those insects actually sounded like.
The result was startling in its implications. The katydids were communicating in ultrasound, frequencies above the range of human hearing, roughly 55 million years before bats evolved their famous echolocation. What had been considered a hallmark of mammalian sophistication turns out to have ancient insect precedent, rewriting the timeline of how high-frequency acoustic signaling developed across the animal kingdom.
Beyond the katydids themselves, the research establishes a new methodology — one that moves paleontology from the reconstruction of appearance toward the reconstruction of experience. The Jurassic forest was not silent; it was layered with calls that guided mating, signaled danger, and shaped entire lives. We cannot hear those calls as they once rang out, but we can now approximate them.
The door this opens is a wide one. If fossilized wing structures can yield sound, researchers are already asking what other sensory worlds might be recoverable — whether the visual experience of extinct animals might one day be approximated through the study of fossilized eyes. The ancient past, it seems, is not as lost as we believed.
A team of scientists has done something that seemed impossible until now: they have listened to the voices of insects that died 165 million years ago. Using fossilized structures preserved in ancient rock, researchers reconstructed the calls of Jurassic katydids—long-bodied insects related to grasshoppers—and discovered that these creatures were communicating in ultrasound, frequencies far too high for human ears to detect without technological help.
The work hinges on a simple but elegant principle: the physical structures insects use to produce sound leave traces in the fossil record. Katydids generate their calls by rubbing their wings together in a process called stridulation, and the microscopic ridges and teeth on their wing surfaces that create this friction can be preserved in fossilized specimens. By studying these anatomical details from Jurassic-era insects, scientists were able to model how sound would have traveled through those structures, then digitally recreate what the insects actually sounded like millions of years ago.
What emerged from this reconstruction was unexpected in its timing. The katydids were producing ultrasonic calls—sounds above 20 kilohertz, beyond the range of human hearing—roughly 55 million years before bats evolved. Bats are famous for their use of ultrasonic echolocation, a sophisticated biological sonar system that allows them to navigate and hunt in darkness. The discovery that insects had already mastered ultrasonic communication in the Jurassic period rewrites the timeline of how this sensory capability developed in the animal kingdom. It suggests that ultrasonic signaling is far more ancient than scientists had previously understood, and that insects may have been the original innovators of this acoustic strategy.
The implications extend beyond a single discovery about katydids. This work demonstrates a new methodology for paleontologists: the ability to reconstruct not just what ancient animals looked like, but what they sounded like, and by extension, what they experienced. The Jurassic forest, it turns out, was not silent. It was filled with high-frequency calls that shaped how these insects found mates, communicated danger, and navigated their world. We cannot hear those calls as they originally sounded, but we can now approximate them, bringing a lost sensory dimension of deep time back into focus.
The research opens a door to other questions. If scientists can reconstruct insect vocalizations from fossilized wing structures, what other sensory experiences might be recoverable from the fossil record? Could researchers one day reconstruct the visual world of extinct animals by studying the structure of fossilized eyes? The Jurassic katydids have shown that the past is not entirely silent or invisible—it is simply waiting for the right tools and the right questions to bring it back.
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